Add controls for full HTML markup access in problems

[quantum5]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1424 into master will increase coverage by 0.55%.
The diff coverage is 79.31%.

@@            Coverage Diff             @@
##           master    #1424      +/-   ##
==========================================
+ Coverage   37.92%   38.48%   +0.55%     
==========================================
  Files         198      201       +3     
  Lines       11337    11407      +70     
==========================================
+ Hits         4300     4390      +90     
+ Misses       7037     7017      -20     

Impacted Files	Coverage Δ
judge/migrations/0108_bleach_problems.py	0.00% <0.00%> (ø)
judge/admin/problem.py	57.23% <22.22%> (-2.21%)	⬇️
judge/models/problem.py	52.11% <66.66%> (+0.15%)	⬆️
dmoj/settings.py	97.61% <100.00%> (+0.04%)	⬆️
judge/jinja2/markdown/__init__.py	59.66% <100.00%> (+25.35%)	⬆️
judge/jinja2/markdown/bleach_whitelist.py	100.00% <100.00%> (ø)
judge/jinja2/markdown/test_markdown.py	100.00% <100.00%> (ø)
... and 3 more

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